This page is designed to help you find out whether anonimiza.do is good and if it is the right choice for you.
anonimiza.do anonymizes documents automatically so they can be shared or published under the GDPR. Upload a PDF, Word file, spreadsheet, scan or ZIP; it finds the personal data, replaces it according to your rules and returns the file in its original format, without metadata.
It is built for Spanish documents: it validates DNI, NIE, CIF, Social Security numbers and IBAN by check digit, resolves every mention of the same person, catches data hidden in QR codes and barcodes, and flags indirect identifiers such as "the applicant's brother". You can add your own data types in plain language.
Choose masking, stable tokens or synthetic data per data type; anonymize irreversibly or pseudonymize with a separate mapping table; check k-anonymity before an open-data release. Web interface and REST API, single documents or batches.
EU servers with no international transfers, ENS MEDIUM certification, automatic deletion from 24 hours. Free plan with 3 documents a month; Professional from €23/month.
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Automatic PII detection
Finds 20 personal data types across 7 families, from names and contact details to vehicle plates, QR codes and indirect identifiers.
Spanish ID validation
Recognises DNI/NIF, NIE, CIF, passport and Social Security numbers and IBAN, and validates them by check digit.
OCR for scanned documents
Reads scanned PDFs and photos before detection and applies the substitution to the image itself.
Batch processing
Anonymizes documents in batches as well as one by one, from the web interface or the REST API.
Pseudonymization
Reversible pseudonymization with a separate mapping table, as an alternative to irreversible anonymization.
Tokenization
Replaces each data point with a stable token such as [PER_1], the same for every mention of the same person.
Synthetic data
Replaces personal data with synthetic values instead of masks or tokens, chosen per data type.
k-anonymity check
Verifies k-anonymity before a statistical or open-data release.
Metadata removal
Strips the metadata and returns the file in its original format.
Audit log
Activity log, plus review with versioned approval before a document is published.
REST API
Anonymizes documents from other applications through a REST API, included from the Professional plan.
EU hosting
Processed on AWS in Frankfurt with no international transfers, with an option for the AWS region in Spain.
It is built around Spanish documents rather than adapted to them. It validates DNI, NIE, CIF, Social Security numbers and IBAN by check digit, deliberately leaves references to laws and decrees untouched, groups every mention of the same person so one decision applies throughout, and finds personal data that is easy to miss: inside QR codes and barcodes, in Word footers and tracked comments, and in indirect references such as "the mayor of a town of 3,000". It is also certified under Spain's National Security Framework (ENS).
Because black boxes drawn in a PDF viewer do not anonymize anything: the text stays underneath and comes back with copy and paste. anonimiza.do actually replaces the data, removes metadata and returns the file in its original format, with review before publishing and an activity log. It recognises Spanish identifiers out of the box, runs on EU servers with no international transfers, and starts free: 3 documents a month with no credit card, then €29/month (€23 billed annually) for 50 documents with OCR, batches and API.
Organisations in Spain that have to share or publish documents containing personal data: law firms and in-house legal teams, HR departments, public administrations publishing on transparency portals and contractor profiles, clinics and hospitals preparing records for research, accounting and advisory firms, and insurers. It suits both the professional who anonymizes a few documents a month and the organisation that needs batches, an API and single sign-on.
anonimiza.do is built by Cedesa Digital S.L., a software company in Badajoz, Spain, certified under Spain's National Security Framework (ENS). Its CEO, Suso Merino, is a computer engineer with a university degree in technology law who works as a court-appointed computer forensics expert in Spain. The product follows the same standard: anonymization has to hold up under scrutiny, not just look right on screen, so it replaces the data instead of covering it, strips metadata, keeps an activity log and validates Spanish identifiers by check digit.
Detection combines several layers, because no single method works for everything: pattern rules with check-digit validation for structured identifiers such as DNI, NIE, Social Security numbers and IBAN (ISO 13616), NLP models for names and context, coreference resolution to group mentions of the same person, and OCR for scans and photos, where the substitution is applied to the pixels themselves. It runs as a web application with a REST API on AWS in Frankfurt (EU), with TLS 1.3 in transit and AES-256 at rest.
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